Take-up mechanism for looms



March 28, 1950 g, LlBBY 2,591,777

TAKE-UP MECHANISM FOR LOOMS Filed April 16, 1947 IN V EN TOR.

Q/Z W, I

Patented Mar. 28, 1950 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to a take-up mechanism for a loom. In order to obtain a fabric of uniform quality from a loom, several conditions must be met, one of which is the maintenance of a constant rate of feed of the fabric as it is woven, a take-up mechanism being employed for this purpose. For successful operation, the take-up mechanism must feed the fabric without slipping and Without injuring the fabric. It is an objectof this invention to provide an improved take-up mechanism which functions in this manner.

According to the invention, my improved takeup mechanism includes a pair of feed rolls between which the fabric passes, these rolls being positively kept from actual contact by means which provide for an adjustable minimum clearance. The mechanism also includes means by which any increase of tension on the fabric results in a corresponding increase in the force by which one feed roll is pressed toward its position of maximum permitted proximity to the other roll.

Other advantageous features will be apparent to one skilled in the art from the following description of the invention, and from the drawing, of which:

Figure 1 is a section on the line ll of Figure Figure 2 is a side elevation, partly in section, of the apparatus shown in Figure 1, the parts being in a different position;

Figure 3 is a plain view of the apparatus shown in Figure 1, portions being broken away to show in section.

The take-up mechanism illustrated on the drawing is mounted on suitable brackets ii] and 12 which project from and are a part of the main supporting frame of a loom. Between the brackets it and i2 is journalled a horizontal feed roll l4, the shaft I 6 of which is driven through gearing (not shown) within the bracket it which is hollow. The peripheral surf-ace of the roll M is preferably knurled or otherwise roughened so as to provide a non-slip surface for the fabric F which is fed thereby. Hinged to the frame brack ets l and I2 is an auxiliary frame which is rockable about the axis of a hinge pin ll, this shaft being supported between the brackets l0 and I2 below the roll it as indicated in Figure 1. The auxiliary frame includes parallel arms I8 and 20 each of which is forked as shown in Figures 1 and 2. J ournalled in the arms l8 and 20 below the forks is a second feed roll 22, this roll being rotatable about an axis parallel to the axes of the shaft I6 and the hinge pin l1. The forks of the arms l8 and 20 areabove the roll 22, one arm of each fork supporting between them a guide roll 30 which is journalled in the auxiliary frame to rotate about an axis 32 parallel to the axis of the shaft it. The guide roll 30 is above the driven roll [4 and is in a position to receive a loop of the fabric F before it passes around the driven roll 14. The guide roll 30 and the second feed roll 22 are preferably so located with reference to the feed roll I4 that the fabric F is constantly in contact with considerably more than half the circumference of the roll M. This gives the roll i l a good grip on the fabric and is an effective factor in the prevention of any slipping of the fabric 'on the roll I 4. As is evident from Figure l, tension on the fabric pulls the roll 3!] toward the left and thus tends to rock the auxiliary frame in the same direction so as to press the roll 22 toward the roll [4 with a force proportional to the tension on the fabric.

In order to avoid a crushing pressure on the fabric as it passes through the nip between the rolls l4 and 22, a stop means is provided to limit the approach of the roll 22 to the roll [4. As shown, the stop means may comprise a set screw 34 which is threaded through each arm l8 and 20 in a direction to engage bearing members 36 and 38 on the main frame brackets l0 and I2, respectively. On each set screw 34 a lock nut 40 may be provided to maintain its set screw in any adjusted position.

The other branch 42 of each arm of the auxiliary frame defines a notch 44 in which a journal of a weight roll is loosely received. This weight roll rests by gravity upon the second feed roll 22 and is geared thereto by gear teeth 52 which mesh with corresponding gear teeth 54 at an end of the roll 22 so that there is no slipping between these two rolls. This insures proper supplementary feeding of the fabric when it leaves the nip between the rolls l4 and 22 and prevents the fabric from being carried around the roll 14 after it passes through the nip. The upper end of each branch 42 is curved to form a hook 56. Within these hooks the journals of the roll 50 are supported when the auxiliary frame is swung forward and downward to its idle position as shown in Figure 2.

Various modifications and changes may be made in the particular embodiment of the invention herein shown and described without departing from the scope thereof as defined in the following claims.

I claim:

1. A take-up mechanism for looms, comprising a supporting frame, a driven feed roll Journalled on said frame, an auxiliary frame rockably mounted on said supporting frame, a second feed roll journalled on said auxiliary frame and movable therewith toward and from said driven roll, a guide roll journalled on said auxiliary frame in position to receive a loop of fabric from the loom before the fabric reaches said driven roll, a weight roll loosely supported by said auxiliary frame to bear on said second feed roll, and meshed gears on said weight roll and second feed roll.

2. A take-up mechanism for looms, comprising a supporting frame, a driven feed roll journalled in said frame, an auxiliary frame rockably mounted on said supporting frame, a sec-- ond feed roll journalled in said auxiliary frame and movable thereby toward and from said driven roll, adjustable stop means positively limiting the approach of said second feed roll to said driven roll, means for pressing said second feed roll toward the driven roll with a force proportional to fabric tension, said means including a 4 guide roll carried by said auxiliary frame in a position to receive a loop of the fabric before it reaches the driven roll, and a weight r011 loosely supported by said auxiliary frame and resting upon said second feed roll.

CARL F. LIBBY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

